Define a F# function in VB.NET

Question

I have defined a F# function in my VB code as follow:

Dim g As Microsoft.FSharp.Core.FSharpFunc(Of Double, Double)

How can I assign g to a particular function: for example I want g(x) = x^2? What is the syntax for it in VB.NET ?

Answer 1

In addition to what Reed says, the FSharp.Core library actually defines a helper method that will turn a delegate (which you can create using lambdas) into an F# function.

You can find it in FuncConvert.ToFSharpFunction see MSDN for more info. I would recommend using this function over creating a custom class, because it relies less on internal details of how the F# compiler compiles functions (you still need to know about the FSharpFunc type, but not as much...)

I don't know much about VB, but I suppose something like this might work:

Dim g = FuncConvert.ToFSharpFunction(Function(x As Double) x * x)